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This article mainly explains how to assign values to arrays in C#. Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to assign values to arrays in C#.

1. The definition of the array

In the third article, you learned that variables are used to store a value. So, what method should we use if we want to store more values?

Array is one of the methods that can be used to store multiple values. However, the array also has limitations, for example, the values in the array must be of the same data type, and the array is of a fixed size, so the size of the array cannot be changed arbitrarily.

2. Array assignment

In C #, there are three ways to create an array:

First, assign a value through an index value

Int [] nums = new int [3]

Nums [0] = 1

The new-array is the reference data type in C #, so the new keyword is used to create the array instance.

Int [3]-indicates that the size of the array is 3, that is, the length is 3, and three values of the same type can be stored.

Nums [0]-represents the value of the first position of the array nums. With regard to the problem of indexing, it is explained in detail below.

Second, declare arrays and assign values directly at the same time

Int [] nums = {1,2,3}

This method does not use the new keyword to create an array instance, but the compiler adds it at compile time.

The number of values in curly braces will be the size of the array. Each value is arranged in an array in order.

Third, create and initialize the array

Int [] nums = new int [3] {1,2,3}

Int [3]-the number of values in square brackets is optional. If the size is specified, the number of values followed by curly braces must be the same as the size; if not specified, the number of values in braces will be the size of the array.

3. Array index

The elements in the array are accessed through the array name with an index. Therefore, you can modify the elements at the specified position in the array, and so on.

For example, change the second position element in the following array to 7. 0.

Int [] nums = {1,2,3}

Nums [1] = 7

In this way, the modification has been completed. Use the foreach loop to look at the elements in the array.

For (int elm in nums) {

Console.WriteLine (elm)

}

As you can see from the result, the value of the second position of the array has been changed from 2 to 7.

I would also like to talk about the index here:

In most programming languages, indexing usually starts at 0. So nums [0] represents the first position in the array; nums [1] represents the second position in the array. and so on.

4. Multidimensional array

All of the above belong to one-dimensional arrays, but in reality, one-dimensional arrays may not be enough to meet our needs, and more dimensional arrays may be needed.

One-dimensional array: [1, 2, 3, 4, 5]

2D array: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

From the above, a two-dimensional array is an one-dimensional array with an one-dimensional array in it. In other words, a two-dimensional array is an array of arrays.

Int [] nums = new int [2] [2]

Nums [0] [0] = 1

Nums [0] [1] = 2

Nums [1] [0] = 3

Nums [1] [1] = 4

/ / nums = [[1,2], [3,4]]

The creation and assignment of a two-dimensional array is actually the same as an one-dimensional array.

And so on, multi-dimensional arrays are constantly nesting babies, arrays are covered with arrays, infinite sets.

At this point, I believe you have a deeper understanding of "how to assign values to arrays in C#". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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